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Robust Kiss1 and Gpr54 expression in the arcuate nucleus which modulates reproductive activity and preoptic area are located in two regions of the brain the classic metabolic pathways of the arcuate nucleus, NPY [neuropeptide Y] and the « newly» identified Kisspeptin network [Am. J. Physiol. Endocrinol. Metab. (2008)]. This molecule involved in all phases of reproductive life respectively GPR45 inactivation does not impede neuroendocrine onset of puberty; rather [.0005], it delays and slows down pubertal maturation of the gonadotropic axis. So-called isosexual precocious puberty, rather than delay of sexual maturation . Reproduction depends on regulated expression of the LH-beta gene, in normal children at pubertal stages I to V, boys shift to more acidic isoforms of LH [luteinizing hormone] by pubertal stage II there were no significant differences in the median charge of LH in pubertal girls.
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